Ignore the scare tactics! If you've decided to learn Czech, the first thing that other learners or (especially) natives may do is tell you how hard it is. It's got 7 cases, unpronounceable consonant clusters, irregular plurals, unrecognisable vocabulary, the hard-to-pronounce letter Å, lions and tigers and bears, oh my!!!
Definition of villainous. 1a : befitting a villain (as in evil or depraved character) a villainous attackb : being or having the character of a villain : depraved the villainous foe.
A callous person is insensitive or emotionally hardened. If you laugh at your little sister while she's trying to show you her poetry, you're being callous. Callous comes from the Latin root callum for hard skin. If you walk barefoot a lot, your feet will become calloused. We usually use callous in the metaphorical sense for emotionally hardened. If someone is unmoved by other people's problems, you might say he shows a callous indifference to human suffering.